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I have found that Windstar sliding doors are subject to amnesia. If they are not opened and closed regularly, they "forget" what they are supposed to do. I make it a point to use my fob regularly to open and close the door (one in my case) to keep it focused on the job at hand

When my "door ajar" light was on it was because the liftgate sensors (switches) indicated that the gate was open, even thought it wasn't. I took off the plastic trim, and took out the sensors - but that isn't necessary. Just soak with the switches with silicone spray, and see if that helps. There is one on each side of the liftgate - I believe both must indicate "closed" for the light to go off.

I have gotten replacement motors at Checkers for both driver and passenger doors - so now I have lifetime replacement motors.. The first time you replace them, a little drilling is needed on the door sheet metal, but it will not show up once the trim is reinstalled. This repair is a little involved, but well within the capability of a novice mechanic.

It drove me nuts too. Fortunately, the solution is both cheap and simple. There is a latch mechanism in each side of the tailgate which gets all filled with dirt and slime.The latch jaws start to stick and dont move far enough to close the door ajar switch inside the tailgate Spray each latch generously with WD40, wipe the mechanisms off with a rag, close the tailgate, open the tailgate and repeat the cleaning several times. As soon as you get everything freed up, the switch will be able to report that the tailgate is closed and the problems will be gone. If you want, afterwards you can spray a little lithium grease on the latches to keep things running smooth. You may need to use a screwdriver to completely pry open the jaws in conjunction with opening the tailgate handle to get them to open fully while you are washing and wiping them off. Now's a real good time to lubricate all the door hinges and latches including the sliding door. May as well put some oil on the hood hinges and hood latch too.It's not impossible to keep Fords on the road....just tricky......very tricky.

Remove "Door Ajar" switch. Clean the switch and use a graphite type lubricant (I recommend "Dry-Slide") to lubricate the actuator on the switch. Reassemble the switch.

The switches are located inside the door panels, attached to the catch mechanism.

1) Remove interior door panel.

2) Using a T-27 Torx driver, remove the 3 bolts holding the catch in the door.2a) The door ajar switch is the only part on the mechanism with the 2-wire harness.2b) The switch is located at the rear catch for the sliding door.

3) Using a small flat screwdriver, gently lift the black tab on the catch mechanism and rotate the switch to remove it from the catch assembly.

4) Using a rag, clean the small round actuator and apply a small amount of graphite lubricant to the actuator and work the switch so it moves freely.